$ hexdump -C in.txt | head -1
00000000  e6 88 96 e5 95 8f 20 57  41 4b 55 4d 4f 4e 20 31  |...... WAKUMON 1|
$ unicode_char_name_fm_code_point.pl e6 88 96
e6 88 96 : U+6216: CJK UNIFIED IDEOGRAPH-6216
$ unicode_char_name_fm_code_point.pl e5 95 8f
e5 95 8f : U+554f: CJK UNIFIED IDEOGRAPH-554F